Agreed. This never happened before ios5. Is new information being synced? And why is it always for 233 songs only (in my case)?

Does anybody know ANYTHING about this?

i'm getting this also. seems to always sync 91 songs and always the same songs. the sync completes ok (no hangs etc) but i wonder what exactly is being sync'd and why the same quantity/tunes each time?!

does not matter if genius is on or off on the left sidebar, i still get the syncs

It definitely seems like a bug in the way genius data is stored on an iOS music database.

Note that the initial genius sync could take a while so let it run once but if you keep seeing a portion of your library syncing genius data then you are experiencing the bug.

It looks like it's caused by having two or more songs with the same name in your library. They do not have to be exactly the same but one has to at least begin with the full name of the other. The songs do not have to be from the same artist. At least one of the songs needs to have genius data that is trying to sync with a device.

For example here are some of the songs that have multiple similarly named songs in my library. These will cause one of the songs in the set to have continuous genius syncing:

Novocaine for the Soul by Eels
Novocaine for the Soul (Live from Hell) by Eels
Novocaine for the Soul (Moog Cookbook Remix) by Eels

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Icky Thump by The White Stripes
Icky Thump (Live) by The White Stripes

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Shoot to Thrill by AC/DC
Shoot to Thrill (Dummy audio track I recorded and gave same name as another song)

I'll be submitting a bug detailing this. Submit duplicates of the bug so Apple will pay attention to this.

Note to iTunes Match users. It also appears that after an iTunes Match update (adding new music) iTunes will perform a sync of a larger section of the Genius Data information. This is likely due to the fact that iTunes Match and Genius are tied together and perhaps doing an iTunes Match update brings down slightly altered Genius Data.

I do have a few songs with nearly the same title, but I'd hoped that IOS 6 would stop the continuous syncing thing. I guess it's not actually hanging, so maybe it's not the same problem others were describing, but I don't know what good it is supposed to be doing me to have this information synced at all.